Prediction of Pressure Gradient and Holdup in Small Eötvös Number Liquid-Liquid Segregated Flow

Abstract

Abstract: The segregated flow pattern, which occurs in a 26.1 mm diameter, horizontal, stainless steel test section, is investigated. Pressure gradient and in situ phase distribution data were obtained for different combinations of phase superficial velocities ranging from 0.05 m·s^-1 to 0.96 m·s^-1. For the current small Eötvös number liquid-liquid system (E_oD=4.77), the dominant effect of interfacial tension and wall-wetting properties of the liquids over the gravity is considered. The approach introduces the closure relationship for the case of turbulent flow in a rough pipe, and attempts to modify the two-fluid model to account for the curved interface. In present flow rates range, wave amplitudes were found small, while interfacial mixing was observed. An adjustable definition for hydraulic diameters of two fluids and interfacial friction factor is adopted. The predicted pressure gradient and in situ phase distri-bution data have been compared with present experimental data and those reported in the literature.

Key words: two-fluid model, pressure gradient, holdup, liquid-liquid flow, interfacial shear

摘要： The segregated flow pattern, which occurs in a 26.1 mm diameter, horizontal, stainless steel test section, is investigated. Pressure gradient and in situ phase distribution data were obtained for different combinations of phase superficial velocities ranging from 0.05 m·s^-1 to 0.96 m·s^-1. For the current small Eötvös number liquid-liquid system (E_oD=4.77), the dominant effect of interfacial tension and wall-wetting properties of the liquids over the gravity is considered. The approach introduces the closure relationship for the case of turbulent flow in a rough pipe, and attempts to modify the two-fluid model to account for the curved interface. In present flow rates range, wave amplitudes were found small, while interfacial mixing was observed. An adjustable definition for hydraulic diameters of two fluids and interfacial friction factor is adopted. The predicted pressure gradient and in situ phase distri-bution data have been compared with present experimental data and those reported in the literature.

关键词: two-fluid model, pressure gradient, holdup, liquid-liquid flow, interfacial shear

LIU Yiping, ZHANG Hua, WANG Shuhua, WANG Jing. Prediction of Pressure Gradient and Holdup in Small Eötvös Number Liquid-Liquid Segregated Flow[J]. , 2008, 16(2): 184-191.

刘夷平, 张华, 王淑华, 王经. Prediction of Pressure Gradient and Holdup in Small Eötvös Number Liquid-Liquid Segregated Flow[J]. , 2008, 16(2): 184-191.

References

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